Improvement in fastenings for sheet-metal



t @met l fina.

THEODORE J. DIEDRICH vAND*- FRANKLIN DIElRICI-IS, OF PI-IILAf` DELPHIA', PENNSYLVANIA. l

Leners Patent No. 86,911, dem Febmmy 16, 1869.

IMPROVEMENT IN FASTENINGS 'ron 'SHEET-METAL.

The. schedule referred/to in these Letters Patent and nhaking part of the same.

To all whom it may concern: M M nre pieces of sheetmetztl, which overlap each 'Be it known that WeTHEODORE J. DIEDRICH and other about three-fourths of en inehpmore or less. FRANKLIN DrnDRIcHs, of the city of Philadelphie, in Within this spuee und, thlOugu beth Pleees 0f meten, the county of Philadelphia, and State of Pennsylvania, lseut el" stamped n sel'les 0f Tshaped tongues; P and have invented a new and improved Mode of Seculing .P i Willen tre Pressed through 1u the tunnner'snewn the Edges of Metal; and we do hereby declare that the m g- 2- f i following is n full, clear, and exact description of the The under tOugueP nets us e spuug, und es seen as construction and operation of the salme, reference being the edges 0f the metal nre Pulled 1n eppnhslte dneetlens, had to the accompanying drawings, making a. part. 0f the tongue Pshps up, andthe top pzrrt nts and-catches this Specication, in which... y under the` shoulder o tongue P, thus interlocking them.

Figure 1 is@ View Showing i-,WO edges 0f metal over. Pressure 1s now broughtupon the tongues,'wh1ch drives lapped, end corresponding T-sheped tongues punched P through the Openlng termed, b5' tue euttlng O ut 0f P'v through, and et the same time causes 1t, owing topassmg over Figure 2 is an edge View of Same" ythe heed of P', to pressvit, P', down 1n the centre and Figure 3 is zt view showing the tongues interlocked turn up its edges: thus flvetlng the edges 0f the mete] previous to being pressed together. firmly tugethel* h The nature of our invention consists in cutting or Having thus deseflbed eur mventon stamping, neer the edges of the metal, in one operation Wllnet We eunnl, and desne t0 seeufe by Letters Pnt' and in one direction, zt series of T-shztped tongues, so ent, 1er- Y i o that they will interlock and the upper part of the tongueA Seeul'ln the edges et metnl together by neens 0f spring under the shoulder' of the corresponding tongue, tue tongues P and 1 eut and lllterleeked substttntlnuy and thus cause the edges ofthe metal to hold tighter *1n the mnnnel lleteln -desel'lbeuwhen its edges are pressed in opposite directions, or, in THEODORE J. DIEDRIOH. other words, the greater the strain, the firmer the edges FRANKLIN DIEDRICHS. ofthe metal are held together. Y Witnesses: Y

To enable those skilled in the art to ineke and use ISAAC R. OAKFOBD,

our invention, we will now proceed to describe 'its con- HENRY ROELLIG. struction and operation. 

